Abstract: A new type of plasma cutting inverter is developped. The noncrystalline material is used as the iron core of transformer and MOS-FET is employed for the main circuit switch elements. A single-chip computer controller is applied to get appropriate volt-amp characteristics and cutting procedure. The reliability of the inverter is greatly improved owing to a new type of invert circuit.

Key words: Cutting inverter, Invert circuit, Single-chip computer, modified fatigue model, deep groove ball bearing, fatigue life, load distribution, load sequence